For the first that wasn't guaranteed, the only one I've gotten was a shiny Electrode on Leafgreen. I've got quite a few more now, although some aren't entirely legitimate (3 or 4) and the rest (5 or 6) were traded.
RENAMON!! *weeping* YOU HAVEN'T BENT ANYONE OVER THE SINK AND SHOVED A "CHECK THE STICKY* UP THEIR ASS IN MONTHS!! *curls into ball crying*- Cither3000